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Message-Id: <20220222154634.597067-2-hch@lst.de>
Date: Tue, 22 Feb 2022 16:46:32 +0100
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...nel.dk>, "Theodore Ts'o" <tytso@....edu>,
Ryusuke Konishi <konishi.ryusuke@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-block@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-nilfs@...r.kernel.org
Subject: [PATCH 1/3] mpage: pass the operation to bio_alloc
Refactor the mpage read/write page code to pass the op to bio_alloc
instead of setting it just before the submission.
Signed-off-by: Christoph Hellwig <hch@....de>
---
fs/mpage.c | 50 +++++++++++++++++++++-----------------------------
1 file changed, 21 insertions(+), 29 deletions(-)
diff --git a/fs/mpage.c b/fs/mpage.c
index dbfc02e23d97f..6c4b810a21d0a 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -57,10 +57,9 @@ static void mpage_end_io(struct bio *bio)
bio_put(bio);
}
-static struct bio *mpage_bio_submit(int op, int op_flags, struct bio *bio)
+static struct bio *mpage_bio_submit(struct bio *bio)
{
bio->bi_end_io = mpage_end_io;
- bio_set_op_attrs(bio, op, op_flags);
guard_bio_eod(bio);
submit_bio(bio);
return NULL;
@@ -146,16 +145,15 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
struct block_device *bdev = NULL;
int length;
int fully_mapped = 1;
- int op_flags;
+ int op = REQ_OP_READ;
unsigned nblocks;
unsigned relative_block;
gfp_t gfp;
if (args->is_readahead) {
- op_flags = REQ_RAHEAD;
+ op |= REQ_RAHEAD;
gfp = readahead_gfp_mask(page->mapping);
} else {
- op_flags = 0;
gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
}
@@ -264,7 +262,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
* This page will go to BIO. Do we need to send this BIO off first?
*/
if (args->bio && (args->last_block_in_bio != blocks[0] - 1))
- args->bio = mpage_bio_submit(REQ_OP_READ, op_flags, args->bio);
+ args->bio = mpage_bio_submit(args->bio);
alloc_new:
if (args->bio == NULL) {
@@ -273,7 +271,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
page))
goto out;
}
- args->bio = bio_alloc(bdev, bio_max_segs(args->nr_pages), 0,
+ args->bio = bio_alloc(bdev, bio_max_segs(args->nr_pages), op,
gfp);
if (args->bio == NULL)
goto confused;
@@ -282,7 +280,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
length = first_hole << blkbits;
if (bio_add_page(args->bio, page, length, 0) < length) {
- args->bio = mpage_bio_submit(REQ_OP_READ, op_flags, args->bio);
+ args->bio = mpage_bio_submit(args->bio);
goto alloc_new;
}
@@ -290,7 +288,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
nblocks = map_bh->b_size >> blkbits;
if ((buffer_boundary(map_bh) && relative_block == nblocks) ||
(first_hole != blocks_per_page))
- args->bio = mpage_bio_submit(REQ_OP_READ, op_flags, args->bio);
+ args->bio = mpage_bio_submit(args->bio);
else
args->last_block_in_bio = blocks[blocks_per_page - 1];
out:
@@ -298,7 +296,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
confused:
if (args->bio)
- args->bio = mpage_bio_submit(REQ_OP_READ, op_flags, args->bio);
+ args->bio = mpage_bio_submit(args->bio);
if (!PageUptodate(page))
block_read_full_page(page, args->get_block);
else
@@ -361,7 +359,7 @@ void mpage_readahead(struct readahead_control *rac, get_block_t get_block)
put_page(page);
}
if (args.bio)
- mpage_bio_submit(REQ_OP_READ, REQ_RAHEAD, args.bio);
+ mpage_bio_submit(args.bio);
}
EXPORT_SYMBOL(mpage_readahead);
@@ -378,7 +376,7 @@ int mpage_readpage(struct page *page, get_block_t get_block)
args.bio = do_mpage_readpage(&args);
if (args.bio)
- mpage_bio_submit(REQ_OP_READ, 0, args.bio);
+ mpage_bio_submit(args.bio);
return 0;
}
EXPORT_SYMBOL(mpage_readpage);
@@ -469,7 +467,6 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
struct buffer_head map_bh;
loff_t i_size = i_size_read(inode);
int ret = 0;
- int op_flags = wbc_to_write_flags(wbc);
if (page_has_buffers(page)) {
struct buffer_head *head = page_buffers(page);
@@ -577,7 +574,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
* This page will go to BIO. Do we need to send this BIO off first?
*/
if (bio && mpd->last_block_in_bio != blocks[0] - 1)
- bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);
+ bio = mpage_bio_submit(bio);
alloc_new:
if (bio == NULL) {
@@ -586,9 +583,10 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
page, wbc))
goto out;
}
- bio = bio_alloc(bdev, BIO_MAX_VECS, 0, GFP_NOFS);
+ bio = bio_alloc(bdev, BIO_MAX_VECS,
+ REQ_OP_WRITE | wbc_to_write_flags(wbc),
+ GFP_NOFS);
bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
-
wbc_init_bio(wbc, bio);
bio->bi_write_hint = inode->i_write_hint;
}
@@ -601,7 +599,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
wbc_account_cgroup_owner(wbc, page, PAGE_SIZE);
length = first_unmapped << blkbits;
if (bio_add_page(bio, page, length, 0) < length) {
- bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);
+ bio = mpage_bio_submit(bio);
goto alloc_new;
}
@@ -611,7 +609,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
set_page_writeback(page);
unlock_page(page);
if (boundary || (first_unmapped != blocks_per_page)) {
- bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);
+ bio = mpage_bio_submit(bio);
if (boundary_block) {
write_boundary_block(boundary_bdev,
boundary_block, 1 << blkbits);
@@ -623,7 +621,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
confused:
if (bio)
- bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);
+ bio = mpage_bio_submit(bio);
if (mpd->use_writepage) {
ret = mapping->a_ops->writepage(page, wbc);
@@ -679,11 +677,8 @@ mpage_writepages(struct address_space *mapping,
};
ret = write_cache_pages(mapping, wbc, __mpage_writepage, &mpd);
- if (mpd.bio) {
- int op_flags = (wbc->sync_mode == WB_SYNC_ALL ?
- REQ_SYNC : 0);
- mpage_bio_submit(REQ_OP_WRITE, op_flags, mpd.bio);
- }
+ if (mpd.bio)
+ mpage_bio_submit(mpd.bio);
}
blk_finish_plug(&plug);
return ret;
@@ -700,11 +695,8 @@ int mpage_writepage(struct page *page, get_block_t get_block,
.use_writepage = 0,
};
int ret = __mpage_writepage(page, wbc, &mpd);
- if (mpd.bio) {
- int op_flags = (wbc->sync_mode == WB_SYNC_ALL ?
- REQ_SYNC : 0);
- mpage_bio_submit(REQ_OP_WRITE, op_flags, mpd.bio);
- }
+ if (mpd.bio)
+ mpage_bio_submit(mpd.bio);
return ret;
}
EXPORT_SYMBOL(mpage_writepage);
--
2.30.2
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